Electric grass cutter



April 7, 1931. s. A. WALLACE 1,799,714

- ELECTRIC GRASS CUTTER Filed Feb. 18, 1929 2 Sheets-Sheet 1 I N V ENTOR.

2f Ev /M51. 17. [4474 0705 BY M k ATTORNEY AP 7, 1931- s.'A. WALLACE1,799,714

ELECTRI C GRASS CUTTER Filed Feb. 18, 1929 2 Sheets-Sheet 2 IN VENTOR.SfiMl/EL M14074 L 1704-,

A TTORNE Y Patented Apr. 7, 1931 SAMUEL -A. WALLACE, O1! WOODBURYHEIGHTS, NEW JERSEY nnnormo (mass currnn Application filed February 18,1929. Serial 1T0. 840,788.

This invention generally stated, relates to grass cutters or awn mowersand has more especial relation to grass cutters or lawn mowers which maybe electrically operated.

The primary object of the present invention is toprovide an electricallydriven lawn mower which may receive its electrical energy from acommercial line, the driving parts to be effective in rotating aplurality of horizontally arranged knives movable about .ver-

tical axes.

A further object of the present invention is to rovide a lawn mower ofthe character state in which the knives are carried by a frame which isvertically adjustable with respect to the traction wheels of the mower.

A still further object of the present invention is to provide a lawnmower of the character stated in which the plurality of horizontallyarranged cutting blades are each vertically adjustable with respect tothe carrier frame.

A further object of the present invention is to provide an arrangement,construction, connection and combination of parts for attaining theresults sought in the foregoing objects.

The invention consists of the novel construction hereinafter describedand finally claimed.

' The nature, characteristic features and scope of the invention will bemore fully understood from the following description taken in connectionwith the accompanying drawings forming part hereof, and in which:

Fig. 1 is a view in front elevation of a lawn mower or grass cutterembodying the invention.

Fig. 2 is a view in cross section of Fig. 1.

Fig. 3 is a fragmentary view partly in elevation and partly in sectionillustrating a detail of construction hereinafter referred to.

Fig. 4 is a top orplan view of the lawn mower shown in the foregoingfigures.

. Fig. 5 is a top or plan view of one of the rotary cutters shown inFig. 4.

Fig.6 is a top or plan view of one of the cutter guards shown in Fig. 4.

For the purpose of illustrating my invention I have shown in theaccompanying in the arm 8 of the horizontally disposed drawin one formthereof which is at present pre erred by me, since the same has beenfound in practice to give satisfactory and reliable results, although itis to be understood that the various instrumentalities of which myinvention consists can be variously arranged and organized and that myinvention is not limited to the precise arrangement and organization ofthe mstrumentalities as herein shown and described.

Referring to the drawings in detail, the reference numeral 1 designatesthe traction wheels of the lawn mower. Garried by the stub axles 2thereof are frames 3. Having pivotal connection with the stub axles 2 isthe 5 handle 4 for manual operation of the mower which handle is ofconventional form. Movable vertically with respect to each fran e 3 is amember 5 provided with a pair of laterally extended lugs 6. Attached toand spanning the lugs 6 is a fixed frame comprising a pair ofhorizontally arranged arms 7 and 8, which frame is secured to the lugs 6by means of screws 9. The arms 7 and 8 are connected by means of struts10 to provide strength and rigidity. The forward arms 8 are notcontinuous and their central adjacent ends are connected by means of anupwardly extended motor support 11 which, considered in plan, issubstantially circular in configuration. This support 11 is arranged toreceive a 'con ventional electrical motor 12. The shaft 13 of the motor,which is vertically disposed, is provided with a pair of pulleysdesignated 14 and 15. These pulleys 14 and 15 are connected by belts 17and 16 with other pulleys 18 and 19, which pulleys 18 and 19 are carriedrespectively by vertically disposed shafts 20 and 21, said shafts beingrotatable frame as carried by the lugs 6. Each of the shafts 13, 20, and21 has adjustably fixed thereto as by screws 22 a casing 23. Each casing23 has fixed thereto b means of set screws 24 a rotary blade. ach bladecomprises a sleeve 25 fitted within a casing 23 and is provided at itslower portion with a lurality of cutting blades 26, see Fi 5.

ese cutters 26 provide a plurality of bides each formed upon arcs ofcircles and in effeet, and considered in plan, provide a structureresembling a ratchet wheel. Arranged above each cutter and separated bya casing 23 is a guard 27 provided with prongs 28, see Fig. 6. Thecutting blades 26 cooperating with the members 28 in the rotation of thecutters function to sever or cut grass as is aparent. In order to adjustthe guards 27 use is made of the rods and nuts 29. Thus, the cutters 26may be vertically adjusted and the guards may be vertically adjustedoneindependently of the other, since each has its own means ofadjustment.

The frame composed of the arms 7 and 8 may also be vertically adjustedindependently of the cutter and guards in the following manner: Thefixed frames 3 carried by the axles 2 are provided with grooves toreceive the lower ends of vertical adjusting screws 30, yvhich screwsare provided with lock nuts 31. By proper adjustment the frames 5 may bemoved toward or away from the ground by reason of the slot 32 in theframe 3. Thus, since the frames 5 may be moved upwardly anddownwardlythe entire frame composed of the arms 7 and 8 may be movedupwardly or downwardly irrespective of any individual adjustment of thecutters 26. The reference numeral 33 designates the conventional rolleras carried b the frame 5. It will be understood that t e motor 12 isequipped with conventional conductors 34 for attachment to a commercialelectrical line, as a house circuit.

What I claim is:

1. In a lawn mower, wheels including stub axles, vertical end framesmounted upon said axles, a horizontally disposed cross frame madenon-continuous and arranged between and carried by the side end frames,8. motor plate bridging said cross frame parts, a motor supported uponsaid plate, a horizontally disposed main cutter, a plurality ofauxiliary cutters arranged in horizontal alignment wit said main cutter,and means connected to said motor and cutters for simultaneously drivingthe latter.

2. In a lawn mower, wheels including stub axles, vertical end framesmounted upon said axles, a horizontally disposed cross frame madenon-continuous and arranged between and carried by the side end frames,a motor plate bridging the central gap as formed by the frame parts, amotor supported upon said 1plate, a horizontally disposed main cutteraving a shaft passing vertically through said motor plate, a pluralityof auxiliary cutters arranged in horizontal alignment with said maincutter, means connected to said motor and cutters for simultaneouslydriving the latter, and means for adjusting said frame.

3. In a lawn mower, wheels including stub axles, vertical end framesmounted upon said axles, a horizontally disposed non continuous crossframe arranged between and carried by the side end frames, a motor platebridging the central gap formed by the frame parts, a motor supportedupon said late, a horizontally disposed main cutter aving a shaftpassing vertically through said motor plate, a plurality of auxiliarycutters arranged in horizontal alignment with said main cutter, meansconnected to said motor and cutters for simultaneously driving thelatter, means including set screws and lock nuts for adjusting saidframe, and means for adjusting said cutters vertically and independentlyof said frame.

4. In a lawn mower, wheels including stub axles, vertical end framesmounted upon said axles, a horizontally disposed cross frame madenon-continuous and arranged between and carried by the side end frames,a motor plate bridging the frame parts, a motor supported upon saidplate, a horizontally disposed main cutter having a vertical shaftassing through said motor plate, a plurallty of auxiliary cuttersarranged in horizontal alignment with said main cutter, means connectedto said motor and cutters for simultaneously driving the latter, meansfor adjusting said frame, means including lock nuts for fixing itsposition, and means for adjusting said cutters vertically andindependently of said frame and independently of each other.

SAMUEL A. WALLACE.

